[Trac #853] Rework sugar rotation support

[Zarro Boogs per Child]

#853: Rework sugar rotation support
--------------------+-------------------------------------------------------
 Reporter:  marco   |       Owner:  blizzard 
     Type:  defect  |      Status:  new      
 Priority:  normal  |   Milestone:  Untriaged
Component:  distro  |    Keywords:           
--------------------+-------------------------------------------------------
 This is what has been decided in the design meeting with Pentagram:

  * Sugar should be locked down when rotated. Only home and activity should
 be accessible.
  * We should rotate the screen only for activities that support it. We
 should reset rotation when going back to home screen

-- 
Ticket URL: <http://dev.laptop.org/ticket/853>
One Laptop Per Child <http://laptop.org/>